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Southeastern Complex



Five main northeast trending geological zones dominate the Lac La Ronge area:

The La Ronge region lies wholly within the Churchill River Plain. The withdrawal of the Pleistocene ice sheet contributed to the deranged drainage system. More resistant rocks create barricades to river courses thus the Churchill is seen to follow the trend of supracrustal rock until it meets these resistant rocks and takes abrupt turns to cross them at right angles along topographically lower zones defined by faults/shears. The river increases velocity in narrow defiles through granitic rocks. The river course may mirror a Precambrian surface modified by the Pleistocene glaciers. The east half of the La Ronge map sheet (73P) and the west half of the Pelican Narrows sheet (63M) are available at a scale of 1:50,000 and larger.

The region is easily accessible by all-weather paved highway (The Pan-Am highway) from Prince Albert. The south-eastern sections of the area are accessible from the Hanson Lake road. Relief rarely exceeds 1-200 feet subsequently the rivers and streams between lakes are predominately deep with low energy environments. Rapids do occur, however the accessibility of the area and the history of settlement, hunting and trapping by the Dene usually guarantee the existence of good portages.

A 64 x 260 kilometer long belt of Precambrian, regionally metamorphosed volcano- sedimentary supracrustal rocks (the La Ronge Belt) trends from Lac La Ronge to Reindeer Lake. They are enclosed and intruded by granitic rocks, ranging in composition to diorite to granite. The belt has been metamorphosed through regional metamorphism to lower amphibolite facies. This metamorphism has resulted, along with major tectonic pressures (folding/faulting), in the destruction of most depositional features through the agencies of recrystallization and pervasive alteration. Tectonic overprints of the supracrustals such as migmatization, and plastic to brittle deformation are pervasive. K-Ar and U-Th dating techniques have given an age corresponding to the intense influences of the Hudsonian Orogeny


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Modified on 19 Mar 96